Cashback (2006)

Storyline : When art student Ben Willis is dumped by his girlfriend Suzy, he
develops chronic insomnia after finding out how quickly she moved on. To
pass the long hours of the night, he starts working the late night
shift at the local supermarket. There he meets a colorful cast of
characters, all of whom have their own 'art' in dealing with the boredom
of an eight-hour-shift. Ben's art is that he imagines himself stopping
time.